/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.apache.commons.exec.util;

/**
 * Provides debugging support.
 */
public class DebugUtils {

    /**
     * System property to determine how to handle exceptions. When set to "false" we rethrow the otherwise silently catched exceptions found in the original
     * code. The default value is "true"
     */
    public static final String COMMONS_EXEC_LENIENT = "org.apache.commons.exec.lenient";

    /**
     * System property to determine how to dump an exception. When set to "true" we print any exception to stderr. The default value is "false"
     */
    public static final String COMMONS_EXEC_DEBUG = "org.apache.commons.exec.debug";

    /**
     * Handles an exception based on the system properties.
     *
     * @param msg message describing the problem.
     * @param e   an exception being handled.
     */
    public static void handleException(final String msg, final Exception e) {
        if (isDebugEnabled()) {
            System.err.println(msg);
            e.printStackTrace();
        }
        if (!isLenientEnabled()) {
            if (e instanceof RuntimeException) {
                throw (RuntimeException) e;
            }
            throw new RuntimeException(e);
        }
    }

    /**
     * Determines if debugging is enabled based on the system property "COMMONS_EXEC_DEBUG".
     *
     * @return true if debug mode is enabled.
     */
    public static boolean isDebugEnabled() {
        final String debug = System.getProperty(COMMONS_EXEC_DEBUG, Boolean.FALSE.toString());
        return Boolean.TRUE.toString().equalsIgnoreCase(debug);
    }

    /**
     * Determines if lenient mode is enabled.
     *
     * @return true if lenient mode is enabled.
     */
    public static boolean isLenientEnabled() {
        final String lenient = System.getProperty(COMMONS_EXEC_LENIENT, Boolean.TRUE.toString());
        return Boolean.TRUE.toString().equalsIgnoreCase(lenient);
    }

    /**
     * Constructs a new instance.
     *
     * @deprecated Will be private in the next major version.
     */
    @Deprecated
    public DebugUtils() {
        // empty
    }
}
